ADMIN SHOW DDL [JOBS|QUERIES]

ADMIN SHOW DDL [JOBS|QUERIES] 语句显示了正在运行和最近完成的 DDL 作业的信息。

语法图

  1. AdminStmt ::=
  2. 'ADMIN' ( 'SHOW' ( 'DDL' ( 'JOBS' Int64Num? WhereClauseOptional | 'JOB' 'QUERIES' NumList )? | TableName 'NEXT_ROW_ID' | 'SLOW' AdminShowSlow ) | 'CHECK' ( 'TABLE' TableNameList | 'INDEX' TableName Identifier ( HandleRange ( ',' HandleRange )* )? ) | 'RECOVER' 'INDEX' TableName Identifier | 'CLEANUP' ( 'INDEX' TableName Identifier | 'TABLE' 'LOCK' TableNameList ) | 'CHECKSUM' 'TABLE' TableNameList | 'CANCEL' 'DDL' 'JOBS' NumList | 'RELOAD' ( 'EXPR_PUSHDOWN_BLACKLIST' | 'OPT_RULE_BLACKLIST' | 'BINDINGS' ) | 'PLUGINS' ( 'ENABLE' | 'DISABLE' ) PluginNameList | 'REPAIR' 'TABLE' TableName CreateTableStmt | ( 'FLUSH' | 'CAPTURE' | 'EVOLVE' ) 'BINDINGS' )
  3. NumList ::=
  4. Int64Num ( ',' Int64Num )*
  5. WhereClauseOptional ::=
  6. WhereClause?

示例

ADMIN SHOW DDL

可以通过 ADMIN SHOW DDL 语句查看当前正在运行的 DDL 作业:

  1. ADMIN SHOW DDL;
  1. ADMIN SHOW DDL;
  2. +------------+--------------------------------------+---------------+--------------+--------------------------------------+-------+
  3. | SCHEMA_VER | OWNER_ID | OWNER_ADDRESS | RUNNING_JOBS | SELF_ID | QUERY |
  4. +------------+--------------------------------------+---------------+--------------+--------------------------------------+-------+
  5. | 26 | 2d1982af-fa63-43ad-a3d5-73710683cc63 | 0.0.0.0:4000 | | 2d1982af-fa63-43ad-a3d5-73710683cc63 | |
  6. +------------+--------------------------------------+---------------+--------------+--------------------------------------+-------+
  7. 1 row in set (0.00 sec)

ADMIN SHOW DDL JOBS

ADMIN SHOW DDL JOBS 语句用于查看当前 DDL 作业队列中的所有结果(包括正在运行以及等待运行的任务)以及已执行完成的 DDL 作业队列中的最近十条结果。

  1. ADMIN SHOW DDL JOBS;
  1. ADMIN SHOW DDL JOBS;
  2. +--------+---------+--------------------+--------------+----------------------+-----------+----------+-----------+---------------------+---------------------+---------+
  3. | JOB_ID | DB_NAME | TABLE_NAME | JOB_TYPE | SCHEMA_STATE | SCHEMA_ID | TABLE_ID | ROW_COUNT | START_TIME | END_TIME | STATE |
  4. +--------+---------+--------------------+--------------+----------------------+-----------+----------+-----------+---------------------+---------------------+---------+
  5. | 59 | test | t1 | add index | write reorganization | 1 | 55 | 88576 | 2020-08-17 07:51:58 | NULL | running |
  6. | 60 | test | t2 | add index | none | 1 | 57 | 0 | 2020-08-17 07:51:59 | NULL | none |
  7. | 58 | test | t2 | create table | public | 1 | 57 | 0 | 2020-08-17 07:41:28 | 2020-08-17 07:41:28 | synced |
  8. | 56 | test | t1 | create table | public | 1 | 55 | 0 | 2020-08-17 07:41:02 | 2020-08-17 07:41:02 | synced |
  9. | 54 | test | t1 | drop table | none | 1 | 50 | 0 | 2020-08-17 07:41:02 | 2020-08-17 07:41:02 | synced |
  10. | 53 | test | t1 | drop index | none | 1 | 50 | 0 | 2020-08-17 07:35:44 | 2020-08-17 07:35:44 | synced |
  11. | 52 | test | t1 | add index | public | 1 | 50 | 451010 | 2020-08-17 07:34:43 | 2020-08-17 07:35:16 | synced |
  12. | 51 | test | t1 | create table | public | 1 | 50 | 0 | 2020-08-17 07:34:02 | 2020-08-17 07:34:02 | synced |
  13. | 49 | test | t1 | drop table | none | 1 | 47 | 0 | 2020-08-17 07:34:02 | 2020-08-17 07:34:02 | synced |
  14. | 48 | test | t1 | create table | public | 1 | 47 | 0 | 2020-08-17 07:33:37 | 2020-08-17 07:33:37 | synced |
  15. | 46 | mysql | stats_extended | create table | public | 3 | 45 | 0 | 2020-08-17 06:42:38 | 2020-08-17 06:42:38 | synced |
  16. | 44 | mysql | opt_rule_blacklist | create table | public | 3 | 43 | 0 | 2020-08-17 06:42:38 | 2020-08-17 06:42:38 | synced |
  17. +--------+---------+--------------------+--------------+----------------------+-----------+----------+-----------+---------------------+---------------------+---------+
  18. 12 rows in set (0.00 sec)

由上述 ADMIN 查询结果可知:

  • job_id 为 59 的 DDL 作业当前正在进行中(STATE 列显示为 running)。SCHEMA_STATE 列显示了表当前处于 write reorganization 状态,一旦任务完成,将更改为 public,以便用户会话可以公开观察到状态变更。end_time 列显示为 NULL,表明当前作业的完成时间未知。

  • job_id 为 60 的 JOB_TYPE 显示为 add index,表明正在排队等待 job_id 为 59 的作业完成。当作业 59 完成时,作业 60 的 STATE 将更改为 running

  • 对于破坏性的更改(例如删除索引或删除表),当作业完成时,SCHEMA_STATE 将变为 none。对于附加更改,SCHEMA_STATE 将变为 public

若要限制表中显示的行数,可以指定 NUMWHERE 条件:

  1. ADMIN SHOW DDL JOBS [NUM] [WHERE where_condition];
  • NUM:用于查看已经执行完成的 DDL 作业队列中最近 NUM 条结果;未指定时,默认值为 10。
  • WHEREWHERE 子句,用于添加过滤条件。

ADMIN SHOW DDL JOB QUERIES

ADMIN SHOW DDL JOB QUERIES 语句用于查看 job_id 对应的 DDL 任务的原始 SQL 语句:

  1. ADMIN SHOW DDL JOBS;
  2. ADMIN SHOW DDL JOB QUERIES 51;
  1. ADMIN SHOW DDL JOB QUERIES 51;
  2. +--------------------------------------------------------------+
  3. | QUERY |
  4. +--------------------------------------------------------------+
  5. | CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY auto_increment) |
  6. +--------------------------------------------------------------+
  7. 1 row in set (0.02 sec)

只能在 DDL 历史作业队列中最近十条结果中搜索与 job_id 对应的正在运行中的 DDL 作业。

MySQL 兼容性

ADMIN SHOW DDL [JOBS|QUERIES] 语句是 TiDB 对 MySQL 语法的扩展。

另请参阅